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Quarterly Financial Data (Unaudited) - Consolidated Operating Results by Quarter (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 3,112,218 $ 2,985,281 $ 2,656,348 $ 2,417,576 $ 2,478,627 $ 2,609,307 $ 2,200,374 $ 2,178,170 $ 11,171,423 $ 9,466,478 $ 7,651,319
Gross profit 419,715 425,830 333,371 301,048 322,876 350,631 302,165 266,188 1,479,964 1,241,860 1,013,800
Net income 57,791 124,899 74,706 38,611 115,576 89,849 64,360 48,440 296,007 318,225 200,098
Net income from continuing operations attributable to common stock $ 56,816 $ 124,551 $ 74,365 $ 37,614 $ 113,561 $ 89,313 $ 63,837 $ 48,267 $ 293,346 $ 314,978 $ 198,725
Basic earnings per share from continuing operations attributable to common stock (in dollars per share) $ 0.38 $ 0.82 $ 0.49 $ 0.24 $ 0.72 $ 0.57 $ 0.41 $ 0.31 $ 1.92 $ 2.02 $ 1.26
Diluted earnings per share from continuing operations attributable to common stock (in dollars per share) $ 0.38 $ 0.81 $ 0.48 $ 0.24 $ 0.72 $ 0.56 $ 0.41 $ 0.31 $ 1.90 $ 2.00 $ 1.26